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Zenith

Pumps

Installation,Care andMaintenance

Zenith

Chemical DutyGear Pumps

B-SeriesGear Pumps

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Zenith

Thoroughly read and understand this entire manual

before installation and operation of pump.

Pump Type: Rotary external spur gear, single stream.

Rotation: See pump drawing.

Operating Speed: 3-180 rpm depending upon application conditions and fluid

viscosity.

Temperature: To 300 F (150 C). Heat jacket required for above ambienttemperatures.

Benefits

Specifications

In 1926, Zenith

was approached by thesynthetic fiber industry to design a

pump to provide a precise, pulseless,repeatable flow and assure better quality

control. The options then were the sameas those in the chemical process industrytoday diaphragm, lobe, coarse gear,

piston, plunger and screw pumps. Eachhad problems with pulsation, flow inac-

curacies, multiple seal areas and slippage,which required constant calibration, highmaintenance and extended downtimes.

Zenith

met the challenge anddesigned a rotary external gear pump

of unique precision and simplicity. Man-

ufacturing techniques were developed tohold tolerances to .00005", minimizing

internal clearance to assure accurate andprecise metering. The pumps simplistic

design of only three moving partstwometering gears and a drive shaftpro-vided long life and easy maintenance.

For years since, chemical engineershave relied on Zenith

to provide precision

fluid handling solutions for their mostdifficult pumping applications. Zenith

gear pumps can be found wherever

precise, pulseless, repeatable meteringof fluids is required.

High Accuracy

Stable, repeatable flows are assuredeven under varying conditions of

temperature, viscosity and pressure.

Minimum Pulsation

Unique design offers virtually pulselessflow without valves or flexible elements

to hinder performance.

Precision Construction

Ground and lapped components and

built-in dowels allow for close controlof operating clearances.

High Volumetric Efficiency

Maximum efficiency is achievedwith optimum operating clearances.

Corrosion Resistance

400 series stainless steel provides goodbearing qualities and the necessarycorrosion resistance for most standard

chemical processes.

Maximum Life

Only three moving parts; components

are through hardened to HRc 54 or better.

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Design The B-Series pumps are constructedfrom cutlery grade 420 and 440C stain-

less steel. The pumps consist of two orthree gears rotating in mesh within aclosely fitted housing that is comprised

of three plates. The center or gear platefits closely around the outside diameter

of the metering gears. The front and rearplates sandwich the gear plate and

restrict axial movement of the gears. Inthe BPB, BMB, BLB, and BXB series, the

gear set is comprised of a driving and adriven gear. The BMC series is com-prised of a driving gear and two driven

gears. In all series, the driving gear iskeyed to the drive shaft while the driven

gears ride on stationary arbors.The B-Series pumps have two seal

designs: a mechanical face seal and alip seal (the BMB/BMC has only a lipseal). The standard seal is a single or

double lip seal while the mechanical

face seal is available as an option. Themechanical face seal design consists ofa rotating universal seal coupling that

acts as a coupling between the inner andouter drive shafts and, at the same time,seals against a fixed seal plate or anchor

washer. The mechanical face seal isdependent upon sufficient inlet pressure

(usually 25-50 psi) to force the innerrotating coupling against the outer sta-

tionary anchor. This design is commonin abrasive fluid applications.

Since the metal seal requires sufficientinlet or working pressure to be effective,

a spring-loaded lip seal design is usuallyrecommended. Pumps with lip sealsnormally will only require a flooded inlet.

The BPB pumps use a lip seal with anO ring; the BMB/BMC pumps use a

lip seal alone; and the BLB and BXBpumps use two lip seals. The Teflon

lip seal with stainless steel spring ischemically inert and is most commonly

used for general-purpose metering in avariety of applications.

All B-Series pumps (with the excep-

tion of the BXB) come equipped with anouter drive gear and drive strap. The

BXB Series is direct drive. The outerdrive gear is meshed with a pinion gear

mounted on the output shaft of a motor orgear box. The drive strap is incorporatedinto the design to act as the weak element

in the pump. Should something go

wrong in the process, such as lineblockage, the increased back pressurewill increase the amount of torque

required to turn the pump. The drivestrap is designed with a critical breakingtorque that will allow it to fail before any

excess stress is exerted on the internalpump parts. This protects the precision

manufactured inner workings of themetering pump.

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Operation In the trunnion-ported BPB, BMB andBMC pumps, fluid enters the pump at

the outer drive gear side of the pump. Apassage has been drilled from the inletport up through the front plate into the

center plate gear pocket. Fluid flows intothe gear pocket and fills the gear tooth

volumes. As the gears rotate, the fluid istransported around the outer diameter of

the gear pocket to the discharge side.As the gears mesh together, the fluid is

displaced back down a passage drilledinto the rear plate and out the dischargeport at the rear side of the pump.

In rear-ported BPB, BLB and BXBpumps, fluid enters the pump through a

port drilled into the rear side plate (theside opposite the outer drive gear/shaft).

The fluid again fills the exposed geartooth volumes and is transported aroundthe outer diameter of the gear pocket.

As the gears mesh, the fluid is displaced

out through the discharge port that isdrilled alongside the inlet port in the rearplate.

Since Zenith

pumps are not self-priming, a flooded suction is usually theminimum inlet pressure required. How-

ever, when high-viscosity fluids areused, more time is required to fill the

tooth volumes. As a result, the inletpressure must be increased or the gears

must rotate at a slower speed to ensurecomplete volume filling and to preventcavitation.

Zenith

pumps rely on the meteredfluid for lubrication of internal bearing

areas. The pump should never beallowed to run dry or be allowed to runwith non-lubricating fluids such as water.

Because of close clearances in thebearing areas, lack of sufficient lubrication

can cause pump seizure and possiblycatastrophic failure.

Under extreme conditions, slip mayoccur across the face of the gears from

in between the high-pressure side to thelow-pressure side. Pump efficiencydepends on four factors: fluid viscosity,

pump speed, differential pressure andgear clearances. Under reasonably

stable operating conditions, slip isrepeatable and predictable, and

pump operation can be adjusted tocompensate.

The Zenith

B-Series pumps are

designed for low-temperature operation.

As such, the maximum operating tem-perature should not exceed 300 F.When operating at temperatures above

ambient, heat jackets should be used,and pumps should be heated slowlyand uniformly.

The 400-Series stainless steels usedin the construction of the B-Series

pumps provide sufficient corrosionresistance for most standard chemical

processes. The material hardness willprovide a high degree of wear resistanceas well. However, processes involving

corrosive or abrasive fluids shouldalways be approved by Zenith

.

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Installation Pumps should be carefully unpackedand checked to make sure that the ship-

ment is complete. If any items are miss-ing or damaged, the freight carrier andZenith

should be notified immediately.

The following is a general installationprocedure. For special applications,

considerations, or simply to ask foradvice, please contact our Applications

Engineering Group.It is not recommended to flush

downstream process equipment utilizingZenith

precision metering pumps. Mostfluids used as flushing agents, such as

solvents and water, have a low viscosityand have poor lubricating qualities.

Catastrophic failure may occurunder certain operating conditions. If it

is necessary to flush the system, thefollowing suggestions are recommendedto prevent premature pump failure:

1) If possible, flush the system using alubricating fluid.

2) Minimize the differential pressureacross the pump ports to 25 psi.

3) Reduce the pump speed to anacceptable level (approximately 10rpm).

4) Flush the pump for the shortestallowable time, yielding effective

cleansing of the system, and nolonger than necessary.

5) It is recommended to use a bypass

around the pump as illustrated inFigure A. This will allow for high velocity

flushing of the system while minimizingrisk to the metering pump. During theflush cycle, fluid will pass through and

around the pump. This will allow thesystem to be flushed quickly and

effectively.

To prepare the pump for use:

1) Always flush out the plumbing systembefore connecting the pump.

2) Filters should be installed prior to thepump inlet and should filter ideally to

half the pump gear clearances.

3) Turn pumps by hand before running.Pumps should turn freely.

4) Pivot mount pumps should be mountedin the L-5677 mounting saddle, andthe trunnions should be loosely

tightened to support but not restrictmovement of the pump. Fixed-mountpumps should be installed on an

L-shaped saddle, and mountingscrews securely tightened.

5) Make certain that bearing grease hasbeen applied between the hub andOuter Drive Gear. If necessary, apply

a suitable lubricant to the grease fittinglocated on the pump. Rotate the Outer

Drive Gear, by hand, to ensure that alayer of grease is evenly spreadbetween the hub and outer drive gear

bearing area. Pumps without a greasefitting do not require lubrication.

Note: Lubrication applied to a grease

fitting will not lubricate internal bearingsor come in contact with the pumped fluid.

6) Carefully mesh the outer drive gearwith the drive pinion gear. A backlashof .005" is recommended. Trunnionscan then be securely tightened.

7) Make sure the pump is primed beforestarting. Be sure to apply positive inletpressure when metering high-viscosity

fluids. Pumps with universal face sealsrequire approximately 25-50 psi inlet

pressure to seat the seal.

8) Start the pump slowly and, if possible,operate with a lubricating fluid.

9) When satisfactory operation isachieved, the pump and system may

be gradually brought up to normaloperating conditions.

10) If, at any time during operation, thepump does not appear to be runningsmoothly, stop the pump immediately

to avoid serious internal damage.

Pump

Valve

Bypass

Figure A

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LappingOr Blocking

Figure 1 Note: Part should be rotated by quarter turns as it moves

through a "Figure 8" pattern.

* *

**

**

Cleaning,Inspectionand Repair

Zenith

metering pumps are made forexacting duty. All parts are machined to

extreme accuracy; critical dimensionsare held between one and two ten-thousandths of an inch (.0001"/.0002").

Accurate performance is dependentupon proper handling. Please treat them

with care, and if its at all possible, setaside a separate clean area for pump

maintenance.It is recommended that pump users

institute a program of dimensional in-spection of critical parts in order to keepmaintenance and operating costs at a

minimum. By noting the performance ofa pump immediately before removing it

from service and correlating the perfor-mance to measured component wear,

the user can establish the maximumwear limits for the pumps critical com-ponents. Further, the service life of the

pump can be predicted and downtimescheduled accordingly.

As with any other Zenith

pump,B-Series pumps may be returned toZenith

for complete rehabilitation. This

procedure may be desirable if only afew pumps are involved. If a large

number of pumps are to be maintainedat the users plant, it may be worthwhile

to have key personnel attend a mainte-nance seminar at Zenith

to learn the

manufacturing, gauging, and assemblytechniques involved in producing theB-Series pump. In addition, Zenith

also

offers a contract service program. Pleasecontact Zenith

for further information on

these items.Remember: Zenith

pumps are pre-

cision instruments. You cant keep themtoo clean. The slightest bit of debris maycause damage.

Place two layers of 400-Grit Emery Clothon a lapping block or platea granite flat

is suitable. Apply light pressure to thecomponent and turn it in a Figure 8

pattern (as shown in Figure 1) approxi-mately 10 times until a smooth finishappears. Components that are commonly

lapped are the sides of metering gearsand the inside faces of front, rear and

center plates. The components are nowready to be cleaned. An ultrasonic

cleaner with a safe industrial solvent (Nusolution) is preferred, but you may also

use a large container filled with aboutfour inches of solution.

Caution: Never drop the componentsinto a tank or container; place them gentlyonto the bottom to avoid damage.

Always use clean, lint-free rags andcompressed air to clean components.

Paper towels are not acceptable; theymay leave small pieces of paper and

dust on the components. Use chemicalbrushes to clean between gear teeth,bores and reliefs. Tooth brushes are not

acceptable. After all components arehospital clean, the pump is ready for

assembly.New parts should be deburred and

cleaned using the above procedures.

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BPB SeriesDisassembly

Refer to Diagram 1 on Page 10 (generalreference only).Note: As parts are disassembled, placethem carefully on a clean surface suchas a soft cloth. Do not allow them to

knock together.

1) Remove Outer Drive Gear (18) by firstremoving Drive Strap Screws (28) and

Drive Strap (20). Slide Yoke Retainer

(19) out of slot in Hub (12).2) Pull Outer Drive Shaft (11) out of

Hub (12).

3a) LIP SEAL DESIGN. Place pump in asoft-jawed vise with the Hub (12)

facing upward. Never clamp onlapped surfaces. Remove three #10-24 Hub Screws (27) and Hub (12).Note: We strongly advise removingthe Lip Seal (14) from the Hub (12)

and discarding it.

3b) METAL SEAL DESIGN. Place pump

in a soft-jawed vise with the Hub (12)facing upward. Never clamp onlapped surfaces. Upon removal ofthe three #10-24 Hub Screws (27),

the Hub (12), Coupling Housing (13),Anchor Washer (15) and Universal

Seal Coupling (14) are all easilyremoved. Remove and carefully

store the Compression Spring (16).

4) Turn the pump over and clamp thevise onto the Front Side Plate (1).Remove two of the diagonally opposed

#12-24 Binder Screws (21). Loosen

the other two screws but leave themengaged by two or three threads.

5) Separate the Front Side Plate (1) andRear Side Plate (3) by gently tapping

the slightly engaged Binder Screws(21) with a plastic hammer.

6) Lift off the Rear Side Plate (3), CenterPlate (2) and Spacer (9).

Caution: Do not allow the metering gearsto be lifted out with the Center Plate (2).

They may drop, causing damage to the

gear teeth. On Metal Seal Designpumps, be careful to retain Ball (29).

7) Remove Driving Metering Gear As-sembly (6) by gently turning and lifting.Repeat for Driven Metering Gear (7).

Never use pliers to lift gears. Neveruse a screwdriver to pry gear upward

If there is a film of oil or other tena-cious fluid between the gear and theside plate, it helps to immerse the

parts in solvent. On Metal Seal Designpumps, Driving Metering Gear (6) and

Drive Shaft (4) are not a press fitassembly.

8) Remove Port Seal Screws (23 & 25)and Gaskets (22 & 24). Repeat forShaft Seal Screw (31) and Gasket (30).

9) If the Arbor (5) is to be replaced orthoroughly checked, press out by

using an arbor tool, pressing towardsthe inside of the pump (the shortest

press direction). Repeat for Dowels (10).

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BPB SeriesAssembly

Considerable care should be taken toprevent wedging or jamming. Never

force the parts together. They will dropinto place if properly aligned.

1) Provide a can of clean oil, preferablySAE-50 motor oil or mineral oil.

2) Press Arbor (5) and Dowels (10) intoRear Side Plate (3) using the Driven

Metering Gear (7) as a guide forpress-ing the arbor upright and per-

pendicular to the plate. See Figure 2.3) Install Port Seal Screws (23 & 25) in

both plates with new Gaskets (22 &

24). Repeat for Shaft Seal Screw (31)and Gasket (30).

4) Fix the Rear Side Plate (3) in a benchvise inside face up.

5) Lubricate the drive shaft bearing holeand arbor with a few drops of oil. SeeFigure 3.

6a) LIP SEAL DESIGN. Place Driving

Metering Gear Assembly onto plate.Place the shaft into bearing hole,rotating several times to insure free

rotation.6b) METAL SEAL DESIGN. Place Ball

(29) into depression on shaft seal

screw. Assemble loose-fit DrivingMetering Gear (6), Drive Shaft (4)

and Key (8). Place stub end of driveshaft into bearing hole and rotate

several times to insure free rotation.7) Position Driven Metering Gear (7)

over the Arbor (5), rotating several

times to insure free rotation.8) With a thin film of oil on your fingertips,

lubricate the gear pockets of theCenter Plate (2).

9) Carefully lower Center Plate (2) overgears.

10) Lower Spacer (9) over Dowel (10).11) Place a drop of oil into each port in

Center Plate (2) (i.e. either side of

meshing gear teeth) and turn DriveShaft (4) several times to insure free

rotation. See Figure 3.12) Carefully lower the Front Side Plate

(1) over the Dowel (10) and Drive

Shaft (4).13) Flip pump over in the vise, clamp to

Front Side Plate (1), and insertBinder Screws (21) until finger tight.

Check for free rotation.14) Tighten binder screws to 60 lbs.-in.,

50% of the recommended tightening

torque. Follow the order shown inFigure 4depending on whether the

pump has 4 or 6 binder screws. Besure the pump turns freely.

15) Tighten binder screws to the recom-mended tightening torque of 120

lbs.-in.; follow the order shown inFigure 4.

Note: If the pump will not turn freely aftereach component is installed, then

the last piece installed needs addi-tional attention or replacement.

16) Flip pump over and fix it in a vise. Set

leading chamfer of Lip Seal (14) intoHub (12) opening. For Metal Seal

Design pumps, place CompressionSpring (16) into hole on top of Drive

Shaft (4).17) LIP SEAL DESIGN only. Use of the

Zenith

Lip Seal Installation Guide is

recommended to prevent lip sealdamage. [P/N 14-00131-0001-1

(Items A,B & C)].Set guide (B) downover Lip Seal (14) and against the

Hub (12) in order to compress theseal O.D. and ease its entry into the

hub. See Figure 5.18a) LIP SEAL DESIGN. Holding the Lip

Seal Guide (B) against the Hub

(12), press the Lip Seal Inserter (C)down firmly, but gently, until Lip

Seal (14) is seated against thebottom of the hole. Be careful notto crush the seal. See Figure 5.

18b) METAL SEAL DESIGN. Place the Uni-versal Seal Coupling (14) over the

drive shaft and slide the CouplingHousing (13) over the coupling. The

Anchor Washer (15) is then inserted

into the coupling housing right ontop of the coupling itself. The twoears on the anchor washer fit intogrooves in the housing. See

Diagram 1 Inset.19) LIP SEAL DESIGN only. Place O Ring

(32) over the Drive Shaft (4) andusing the Bullnose (A) on end of

Drive Shaft (4), carefully lower huband seal assembly down over DriveShaft (4). See Figure 6.

20a) LIP SEAL DESIGN. Remove Bull-noseInstallation Tool and rotate Hub (12)

until grease fitting is facing in thedesired orientation.

20b) METAL SEAL DESIGN. Place the Hub(12) on top of the Coupling Housing(13) and orient the Grease Fitting

(26) as desired.21) Insert Hub Screws (27) and tighten

to first 32 lbs.-in. in a circular rotation,then complete tightening to recom-

mended torque of 64 lbs.-in.

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9

Figure 2

Figure 4Figure 3

Figure 6Figure 5

BPB SeriesAssembly(continued)

22) Place Outer Drive Shaft (11) into Hub(12) (when applicable), and rotate

until Drive Shaft (4) and Outer DriveShaft (11) mate.

23) Place Outer Drive Gear (18) overHub (12), insert Yoke Retainers (19)

into appropriate grooves followed byDrive Strap (20) and tighten downwith Drive Strap Screws (28).

24) Pour oil into inlet port to lubricateinternal components, then rotatepump to check for free rotation.

25) Apply standard gun grease toGrease Fitting (26). Conoco SuperLube M EP Grease or equivalent isrecommended.

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Diagram 2

BPB Series

BMB/BMC Series

Diagram 1

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11

BLB Series

Diagram 3

BXB Series

Diagram 4

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12

BMB/BMCSeriesDisassembly

Figure 8Figure 7

Figure 10Figure 9

P/N 15-00131-0009-1

Refer to Diagram 2on Page 10.Note: As parts are disassembled, place

them carefully on a clean surface suchas a soft cloth. Do not allow them toknock together.

1) Remove Outer Drive Gear (2) by firstunscrewing the two #10-24 Drive StrapScrews (32). Remove Drive Strap (31)

and Retaining Rings (30) from Drive

Shaft (8).2) Remove Seal Plate (16) by unscrewing

three #10-24 x 1/2" Seal Plate Screws(20).

3) Clamp Body (1) in a bench vise withRear Side Plate (3) facing upwardand remove Binder Screws (28).Never clamp on lapped surfaces.

4) Lift off Rear Side Plate (3) and CenterPlate (4).

Caution: Do not allow metering gears tobe lifted out with the Center

Plate. They may drop, causingdamage to the gear teeth.

5) Remove Driven Metering Gears (6)from Arbors (10) by turning and lifting

simultaneously. Never use pliers to liftgears. Never use a screwdriver to pry

gears upward.

6) Remove Driving Metering Gear (7) andRound Key (12) in the same way, while

also pulling Drive Shaft (8) outward.

7) Remove Port Plate (5).

8) Remove Lip Seal (15) and discard.

9) Remove Port Seal Screws (24 & 26) andGaskets (25 & 27). Discard gaskets.

10) If the Arbors (10) and/or SleeveBearing are to be replaced or

thoroughly checked, press out byusing an arbor press, pressing

toward the inside of the pump (theshortest press distance.) Removing

these items during general mainte-nance is not recommended.

Caution: Extreme care must be taken

with arbors when pressing outof or installing into cast body.

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BMB/BMCSeriesAssembly


force the parts together. They will dropinto place if properly aligned.


2) Fix Body (1) in a bench vise, insideface up. Install Port Seal Screws (24 &26) with new Gaskets (25 & 27).

3) Lubricate Arbors (10). If the Arborsand Sleeve Bearing were removed,press Arbors into the Pump Body (1)

using a Driven Metering Gear (6) as aguide for pressing arbors perpendicular

(upright) to the plate. Reinstall SleeveBearing lead end first into Body (1)and press in place allowing Sleeve

Bearing to project from inside faceslightly less than the thickness of the

Port Plate (5).

Caution: Extreme care must be taken

with arbors when pressing outof or installing into cast body.

4) Carefully place Port Plate (5) overArbors (10) making sure ports line upwith ports in Body (1). Make sure plate

is not 180 out of position; relief groovesface up toward Center Plate (4).

5) Assemble Driving Metering Gear (7),Round Key (12) and Drive Shaft (8).

6) Lubricate Sleeve Bearing and placeDriving Metering Gear assembly into

Body (1) and through Sleeve Bearing.

Rotate several times to insure freerotation.

7) Place one Driven Metering Gear (6)on its arbor and rotate several timesto be sure it is free. Repeat process

for the other Driven Metering Gear (6).

8) Rub a slight amount of oil over gearrecesses of the Center Plate (4), then

carefully lower over the MeteringGears.

9) Put a drop of oil in the port recesseson either side of the meshing point of

the gears. Turn the shaft to make surethe gears turn freely.

10) Place Rear Side Plate (3) overCenter Plate (4) and screw in BinderScrews (28) finger tight. Again, make

sure pump turns freely.

11) Tighten the Binder Screws (28) to150 lbs.-in., 50% of the recommendedtightening torque. Follow the order

shown in Figure 7. Make sure thepump turns freely.

12) Tighten Binder Screws (28) (followingthe order shown in Figure 7) to rec-

ommended tightening torque of 305lbs.-in. and make sure pump turns

freely.

Note: If the pump will not turn freely aftereach component is installed, then

the last piece installed needs addi-tional attention or replacement.

13) Turn the pump over (so the DriveShaft is facing upward) and clamp on

edges of Rear Side Plate (3) in vise.

14) Use of a Zenith

Lip Seal InstallationGuide (Bullnose) is recommended to

prevent seal damage. Place a newLip Seal (15) over the Bullnose with

spring-loaded open end facing downand push down firmly to slightlyexpand Lip Seal inside diameter.

See Figure 8.

Caution: Do not push the Lip Seal com-

pletely down the bullnose orpermanent damage to the sealmay result.

15) Remove Lip Seal from Bullnose andattempt to slide Lip Seal onto DriveShaft.

16) If the seal does not slip on easily,repeat Step 14, being careful not to

over-expand the Lip Seal. (The sealwill soon recover from the slight

expansion necessary.)

17) Once the Seal is installed onto the

Drive Shaft, place the Seal Plate (16)into position as shown in Figure 9.

18) Install the three Seal Plate Screws(20) and tighten evenly to draw theLip Seal into the pump body, being

careful not to cock the seal or damageit in any way. See Figure 9.

19) Torque the three Seal Plate Screws(20) to 50 lbs.-in.

20) Reinstall Outer Drive Gear (2) withrelieved side upward. Replace

External Locking Retaining Ring (30)

onto Drive Shaft (8).21) Install Drive Strap (31) and Drive

Strap Screws (32).

22) After pouring oil into the inlet port,rotate pump to lubricate internalcomponents and check for free

rotation.

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BLB SeriesDisassembly

Refer to Diagram 3on Page 11.Note: As parts are disassembled, place


1) Remove Drive Strap Screws (28) andDrive Strap (20). Remove Seal PlateScrews (41) and Seal Plate (19) and

remove the Outer Drive Gear (1).

2) Remove Seal Housing (13) and LipSeals (14) in the housing. In all cases

we strongly advise removing and dis-carding used Lip Seals (14).

3) For pumps with a mechanical faceseal, remove Outer Drive Gear (1) byfirst removing Drive Strap Screws(28), Drive Strap (20) and Outer Drive

Shaft (11). Remove Coupling HousingScrews (41) and Seal Plate (2) to

allow outer drive gear to be removed.

4) With the pump ports facing upward,

clamp the sides of the Front SidePlate (2) in a vise. Note: Never clampthe pump on a lapped surface.Loosen the four 1/2-13 Binder Screws

(21) and remove two diagonal screwscompletely. Back the other two

screws out until only one or twothreads are engaged.

5) Remove the pump from the vise andlay it on its long side on the bench.Separate the Front Side Plate (2),Center Plate (4) and Rear Side Plate

(3) by gently tapping the engaged

Binder Screws (21) with a plastic

hammer. Some process fluids makedisassembly difficult, and a soft-face,

dead blow hammer may have to beused in these cases.

6) After the plates are apart, completelyremove the partially engaged Binder

Screws (21). Pull the Front Plate (2)off the Dowels (10) and carefully

remove the Drive Shaft (5), Key (8)

and Metering Gears (6 & 7). Neverpry the pump parts with a screwdriveror similar tool or use pliers to lift the

gears.

7) The Center Plate (4) may, at times, bedifficult to separate from the Rear SidePlate (3). If this is the case, it can

sometimes be loosened by jarring thedowel ends against a table top. To do

this, grasp the Center Plate (4) and,with the Rear Plate (3) upward, give

a downward thrust with the platesparallel to the table top. If this doesntwork, the Dowels (10) must be

pressed out in the direction from theRear Plate (3) through the Center

Plate (4).

8) If the Arbor (9) or Hollow Dowels (10)are to be replaced or checked, use

an arbor tool and press toward theinside of the pump (the shortest pressdistance). If there is residue present

on the surfaces of the front and rearside plates, it is better to remove the

Arbor (9) and Dowels (10) in order

to hand lap, or block the plates asdescribed earlier.

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Figure 11

BLB SeriesAssembly

#1 #3

#4 #2

#1 #3#5

#4 #2#6


force parts together. They will drop intoplace if properly aligned.


2) Using the Driven Metering Gear (7) asan upright guide, press the Arbor (9),using an arbor press, into the Front

Side Plate (2) until flush with the out-side of the plate. Apply a light film of

oil to the Arbor (9) before pressing itinto the plate.

3) Making sure that the surfaces areclean, place the Center Plate (4) ontop of the inside surface of the RearSide Plate (3). Be sure that the port

hole sizes on the Center Plate coin-cide with the port holes on the Rear

Side Plate. The thicker center plateshave only a short portion of the dowel

hole precision ground. This groundportion should be placed adjacent tothe rear plate.

4) Insert the lightly oiled Dowels (10) intothe Center Plate (4) and carefullypress them into the Rear Side Plate

(3) and flush with its outer surface.

5) Place the sub-assembly on a cleanbench top. Making sure that the

Center Plate (4) and Rear Side Plate(3) are in close contact, insert theDriving Gear (6) and Driven Gear (7)

into their respective gear pockets.

Do not force the gears into the gearpockets. If force is necessary, there issomething wrong, and the plates and

gears should be checked for burrs,dents, or the like.

6) Install the Drive Shaft (5) and theDrive Shaft Key (8) into the Driving

Gear (6) and the lightly oiled bearing

of the Rear Side Plate (3). Turn thedrive shaft to assure free rotation of

the gears. If there is any binding,remove the gear shaft and key andexamine for damage.

7) Apply a thin coat of oil to the driveshaft bearing and arbor of the FrontSide Plate (2) and place into position

over Center Plate (4).

8) Insert Binder Screws (21) finger tightand rotate drive shaft to insure free

rotation.

9) Clamp pump into vise by front sideplate edges, Rear Side Plate (3) facing

upward. Tighten Binder Screws (21)in the order shown in Figure 11 to 390lbs.-in., 50% of the full recom-mended

tightening torque. Rotate to make surethe pump turns freely.

10) Tighten Binder Screws (21) in theorder shown in Figure 11 to the full

recommended tightening torque of780 lbs.-in. Rotate to insure freerotation.

11) Install Seal Assembly per instructionson page 18.

Note: If the pump does not turn freely

after each component is installed, thenthe last piece installed needs additional

attention or replacement.

New pumps may occasionally developintermittent bind points or tight spots.

Since precision metering requires minute

tolerances, this is perfectly normal andwill pass quickly as the pump wears

in.

If a tight spot is interfering with operation,it can be reduced or minimized by lifting

one of the metering gears out of thecenter plate and rotating it a few teeth.

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16

BXB SeriesDisassembly

Refer to Diagram 4 on page 11.Note: As parts are disassembled, place


1) Remove the Key (17) from the end ofthe Drive Shaft.

2) Remove the Seal Plate Screws (20).

3) Slide the Seal Plates (13) and Flush

Plate (14) over the end of the shaft.

4) Pry the Lip Seals (31) from the SealPlates and discard. It is recommendedthat the Lip Seals be replaced anytime

the pump is taken apart.

5) Remove the Dowels (9) and Arbor (5)and press in the direction which dis-

engages the press fit in the shortestdistance. Note: Dowels are press fitin the Rear Side Plate and slip fit in

the Front and Gear Plates. The arboris press fit in the Front Plate and slip

fit in the Gear and Rear Plates.6) Place the pump in a vise with the

ports facing upward. Note: Never

clamp the pump on lapped surfaces.Loosen the four Binder Screws (21)and remove two Diagonal Screws.

Back out the remaining two screwsuntil only two or three threads are

engaged.

7) Remove the pump from the vise andlay it on its side.

8) Separate the Front Side Plate (1),Gear Plate (2), and Rear Side Plate(3) by gently tapping the engaged

Binder Screws with a plastic hammer.Some process fluids make disassembly

difficult and therefore a soft-facehammer may be used.

9) After the plates are apart, completelyremove the two remaining Binder

Screws. Separate the plates by gentlytapping them with a soft-head dead

blow hammer. Note: Do not attemptto pry the plates apart or damage to

lapped surfaces may occur.

10) Carefully remove the Drive Shaft (4),Key (8), and Driving Gear Assembly(6) from the Gear Plate (2). Next,

remove the Driven Gear (7).

11) After all components are thoroughly

cleaned, inspected, or replaced, thepump may be reassembled. Note: Ifthe Drive Shaft Bearings (49, 50) are

replaced, they must be honed to theproper inner diameters after beingpressed into the Front (1) and Rear

(3) Plates. Contact Zenith

for details.

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17

BXB SeriesAssembly

Note: Considerable care should be

taken to prevent wedging or jamming ofparts. Never force parts into place. All

parts should drop into place if properlyaligned. During assembly, manually turn

the metering gears to ensure free rotation.If binding occurs at any time, determinethe cause and correct it immediately. A

small nick, burr, or foreign particle may

cause extensive damage to pumpcomponents.


2) Lubricate the dowel and arbor holesin the Front and Rear Plates. Usingthe Driven Gear as a guide, press thearbor (5) into the Front Side Plate (1).

The thermocouple hole in the arborshould be facing upwards. Press the

dowels (9) into the rear side plate (3).

3) Place the rear side plate onto a bench

with the dowels and arbor facing up.4) Lower the gear plate (2) over the

dowels and onto the rear side plate.Ensure that the correct port locationof the gear and rear plates are

maintained.

5) Gently insert the drive shaft (4), key(8), and driving gear assembly (6)

into the gear pocket and rear sideplate bearing. Ensure free rotation of

the drive shaft.

6) Carefully insert the driven gear (7)onto the arbor (5) and lower into thegear plate. Again, ensure free rotation

of the driving and driven gears.

7) Place the front side plate (1) and arbor(5) over the end of the drive shaft and

into position over the dowels.

8) Turn the pump onto its side and insertthe binder screws (21).

9) Place the pump into a vice with thedrive shaft facing down. Tighten thebinder screws to 50% of their rated

torque using a crossing pattern. Turnthe drive shaft to ensure free rotation.

If no binding occurs, completely tightenthe binder screws to 100% of their

rated torque. Again, check for freerotation.

10) Turn the pump over so that the driveshaft is facing up.

11) Insert new lip seals (31) into the sealplates (13).

12) Use of a Zenith

Lip Seal InstallationGuide is recommended to expand

the ID of the seals prior to sliding theseals down the drive shaft preventingseal damage (P/N 15-00131-0026-2).

A piece of tape can also be used

over the keyway located at the endof the drive shaft. This is to preventdamage to the seals during assembly.

13) Slide the seal plates (13) and flushplate (14) over the end of the shaftand onto the front side plate.

14) Insert the seal plate screws (20) intothe seal plates. Allow the plates to

center themselves around the shaftbefore tightening the screws. Torque

the screws to 50% and then 100% oftheir rated torque using a crossing

pattern.

15) Remove the tape from the end of theshaft and insert the key (17).

16) Lubricate the pump by squirtingmineral oil into the inlet port and

rotating the pump shaft until oilappears at the outlet port.

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18

Seal AreaFor BLB LipSeal TypePump

Seal AreaFor BLBMechanicalFace SealType Pump

Figure 13Figure 12

#1

#4

#2

#3

14 13

1) Use of a Zenith

Lip Seal InstallationGuide is recommended to expand the

ID of the seals prior to sliding theseals down the drive shaft preventing

Lip Seal damage (P/N 15-00131-0071-2). Install Lip Seals (14) into Seal

Housing (13) as shown in Figure 12.

2) Carefully lower Seal Housing (13)over Drive Shaft (5) making sure that

the grease hole in the Front Side Plate(2) coincides with the grease hole inthe Seal Housing (13).

3) Apply a thin coat of oil inside the boreof the Outer Drive Gear (1) and care-fully place over Seal Housing (13).

4) Place Seal Plate (19) into Outer DriveGear (1) and install Seal HousingScrews (41) finger tight.

5) Tighten Seal Housing Screws (41) (inorder shown in Figure 13) to 60 lbs.-

in., 50% of the full recommendedtightening torque. Check for free

rotation.

6) Tighten Seal Housing Screws (41) (inorder shown in Figure 13) to the full

recommended tightening torque of120 lbs.-in. Check for free rotation.

7) Place Drive Strap (20) over DriveShaft (5) and install Drive Strap

screws (28). Tighten to full recom-mended tightening torque of 305 lbs.-

in. Check for free rotation.

8) Apply standard gun grease to GreaseFitting (26). Conoco Super Lube M EP

Grease or equlvalent is recommended.

1) Place Coupling Housing (13) on FrontSide Plate (2) making sure that thegrease hole in the coupling housingcoincides with the grease hole in the

front side plate.

2) If the pump is equipped with anAnchor Washer (15), drop it into the

Coupling Housing (13). Make sure itlies flush on the Front Side Plate (2).

3) Place Universal Coupling (14) withproper (shallow) female tang overDrive Shaft (5).

4) Apply a thin coat of oil to the inside

bore of the Outer Drive Gear (1) andcarefully place over CouplingHousing (13).

5) Place Seal Plate (19) onto Outer DriveGear (1) and install Seal Plate Screws(41) finger tight.

6) Tighten Seal Plate Screws (41) (inorder shown in Figure 13) to 60 lbs.-in., 50% of the full recommendedtightening torque. Check for free

rotation.

7) Tighten Seal Plate Screws (41) (inorder shown in Figure 13) to full

recommended tightening torque of120 lbs.-in. Check for free rotation.

8) Install the Drive Strap (20) over thetang on the Outer Drive Shaft (11)and fasten to the Outer Drive Gear (1)

with Drive Strap Screws (28). Torque

to 305 lbs.-in.9) Apply standard gun grease to Grease

Fitting (26). Conoco Super Lube M EP

Grease or equivalent is recommended.

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19

Size Recommended Torque

(UNC Alloy Steel) (in -lbs)

#10-24 64

#12-24 120

5/16-18 305

1/2-13 780

5/8-11 900

Trouble Probable Cause Remedy

Pump will not turn 1) Drive malfunction Verify drive powered.Check to assure all alarmcircuits are clear. Check

drive motor current and

speed settings.

2) Process conditions Check process conditionschanged for proper temperature,

pressures, viscosities andmaterials.

3) Entrained particle Disassemble and cleanpump; replace any damagedparts.

4) Possible internal Disassemble and cleandamages pump; replace damaged

parts. Consult factory.

No flow from pump 1) Same as above Same as above

2) Pump rotation Correct drive arrangementor power leads

Excessive seal 1) Worn lip seal Replace lip seals.assembly leakage

2) Worn seal plate Replace seal plate andcoupling if necessary.

3) Insufficient inlet (Mechanical Face Sealpressure version)increase inlet

pressure.

Reduced pump 1) Worn gear(s) Replace worn gears.efficiency

2) Worn bearings Replace worn bearings.

3) Process conditions Consult factory for clearancechanged recommendations on new

process conditions.

Trouble-shooting

Bolt Torque

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FAILURE, IMPROPER SELECTION OR IMPROPER USE

OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED

HEREIN OR RELATED ITEMS CAN CAUSE DEATH,

PERSONAL INJURY AND PROPERTY DAMAGE.

This document and other information from Zenith

Pumps, its subsidiaries and authorized distributors provide product

and/or system options for further investigation by users having

technical expertise. It is important that you analyze all aspects of

your application and review the information concerning the product

or system in the current product catalog. Due to the variety of

operating conditions and applications for these products or systems,

the user, through its own analysis and testing, is solely responsible

for making the final selection of the products and systems and

assuring that all performance, safety and warning requirements

of the application are met.The products described herein, including without limitation,

product features, specifications, designs, availability and pricing,

are subject to change by Zenith Pumps and its subsidiaries at any

time without notice.

WARNING

Copyright 2000 Zenith Pumps B C&M 10/04

Zenith Pumps1710 Airport Road

Monroe, NC 28110Phone: 704-289-6511 Fax: 704-289-9273

[email protected] www.zenithpumps.comA Colfax Buisiness Unit

ISO 9001: 2000 Registered

20101217145249187

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